Just like you get with iTunes Match, Amazon Cloud Player can now scan your music library and automatically add high-quality copies of songs to your digital library. Here are the details:

Amazon scans customers' iTunes and Windows Media Player libraries and matches the songs on their computers to Amazon's 20 million song catalog. All matched songs – even music purchased from iTunes or ripped from CDs – are instantly made available in Cloud Player and are upgraded for free to high-quality 256 Kbps audio. Music that customers have already uploaded to Cloud Player also will be upgraded.

This is a great update for fans of the service, and finally gives Cloud Player a little more of an edge against the syncing and matching services of Google Music and iTunes Match.